Question

A 10,000 kw turbo-generator operating at rated capacity receives 52,000 kg/h of steam at 2.90 MPa and 310oC, exhaust is at 0.007 MPa. At 1.2MPa and 230oC, there are actually extracted 20% of throttle flow for regenerative heating of feedwater. The generator efficiency is 95%.

For an ideal engine, find:

a. The quantity of steam extracted, kg/h

b. The work of the engine

c. Thermal efficiency

For the actual engine, find:

d. The temperature of feedwater from the open heater

e. Combined engine efficiency

f. The approximate enthalpy of exhaust steam and its quality

Answer 1

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